Harvey Tool 41420 Thread Mill 6-32 to 6-40 Solid Carbide

Product Description

The HARVEY TOOL 41420 is a single profile thread mill designed to cut both internal and external threads in the 6-32 to 6-40 thread size range, covering 32 to 40 threads per inch (TPI). Built from solid carbide with a bright uncoated finish, this tool offers rigid performance in threading applications where a dedicated full-form tap is impractical or where thread tolerance control is critical. The 0.098-inch cutting diameter and 0.050-inch neck diameter allow access to tight-clearance bores. Four flutes provide chip clearance and cutting efficiency across a range of workpiece materials.

This thread mill is suited for CNC machining centers performing precision threading on small fastener holes in the number 6 screw size range. It handles both internal and external thread profiles, making it a versatile single-tool solution for shops producing threaded features in aluminum, brass, plastics, and softer steels. The 2-inch overall length (OAL) provides sufficient reach for most standard-depth applications without sacrificing rigidity. The 3/16-inch shank diameter fits standard collet chucks commonly used in CNC milling setups.

Key Features

• Covers 6-32 to 6-40 thread sizes in a single tool, reducing tooling inventory
• Cuts both internal and external threads, eliminating the need for separate tap and die setups
• Solid carbide construction provides rigidity and wear resistance compared to HSS alternatives
• 0.098-inch cutting diameter with 0.050-inch neck diameter for access to small-bore threading applications
• 4-flute geometry supports chip evacuation in blind and through-hole configurations
• Bright uncoated finish suitable for use with standard cutting fluids across non-ferrous and ferrous materials

Compatibility

Designed for use in CNC machining centers with collet or end mill holders accepting a 3/16-inch shank diameter. Suitable for threading number 6 fastener holes requiring 32 to 40 TPI in both internal and external configurations.

Installation Notes

Thread mills require a CNC machining center capable of helical interpolation; consult your CAM software for proper thread milling toolpaths. Ensure the spindle and collet are clean and the tool is seated fully before tightening. Use appropriate cutting fluid for the workpiece material to extend tool life and maintain surface finish. Verify programmed thread depth and pitch before running the first part.